//#include "pstdint.h" /* Replace with <stdint.h> if appropriate */
#include "Common.h"

#undef get16bits
#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) ||        \
    defined(_MSC_VER) || defined(__BORLANDC__) || defined(__TURBOC__)
#define get16bits(d) (*((const uint16_t *)(d)))
#endif

#if !defined(get16bits)
#define get16bits(d)                                                           \
    ((((uint32_t)(((const uint8_t *)(d))[1])) << 8) +                          \
     (uint32_t)(((const uint8_t *)(d))[0]))
#endif

uint32_t SuperFastHash(const char *data, int len) {
    uint32_t hash = len, tmp;
    int rem;

    if (len <= 0 || data == NULL)
        return 0;

    rem = len & 3;
    len >>= 2;

    /* Main loop */
    for (; len > 0; len--) {
        hash += get16bits(data);
        tmp = (get16bits(data + 2) << 11) ^ hash;
        hash = (hash << 16) ^ tmp;
        data += 2 * sizeof(uint16_t);
        hash += hash >> 11;
    }

    /* Handle end cases */
    switch (rem) {
    case 3:
        hash += get16bits(data);
        hash ^= hash << 16;
        hash ^= data[sizeof(uint16_t)] << 18;
        hash += hash >> 11;
        break;
    case 2:
        hash += get16bits(data);
        hash ^= hash << 11;
        hash += hash >> 17;
        break;
    case 1:
        hash += *data;
        hash ^= hash << 10;
        hash += hash >> 1;
    }

    /* Force "avalanching" of final 127 bits */
    hash ^= hash << 3;
    hash += hash >> 5;
    hash ^= hash << 4;
    hash += hash >> 17;
    hash ^= hash << 25;
    hash += hash >> 6;

    return hash;
}
